The meaning of the equinox of day and night in autumn.

The autumnal equinox is the sixteenth of the twenty-four solar terms. Like the spring equinox, it means the equinox of day and night in autumn. Although there is "one autumn rain and one cold", the daily precipitation after the autumnal equinox will not be very large, and the rainy weather is relatively much less than in the previous stage. As a solar term with equal time between day and night, people should also maintain their health based on the law of yin and yang balance.

On the day of the autumnal equinox, there is also the custom of "erecting eggs". The spring and autumnal equinoxes are the days when day and night equinox in the northern and southern hemispheres. The earth's axis and the orbital plane of the earth's revolution around the sun are in a state of relative balance of forces, so it is easier for eggs to stand upright. In ancient times, children had very few things to play with. There were not as many toys as there are today, so they would never let go of any opportunity to play in nature.

Extended information:

In ancient times, there was a saying that "spring offers sacrifices to the sun and autumn offers sacrifices to the moon." The autumnal equinox was once a traditional "moon sacrifice festival." The current Mid-Autumn Festival comes from the traditional "Moon Sacrifice Festival". According to research, the original "Moon Sacrifice Festival" was set on the autumnal equinox. Later, because the day of this day in the eighth month of the lunar calendar was different every year, there was not necessarily a full moon, and the lack of a moon in the lunar calendar would greatly ruin the scenery. Move the "Moon Sacrifice Festival" from the autumnal equinox to the Mid-Autumn Festival.

Reference material: People's Daily Online - Autumnal Equinox